check web redirect url status code checker

Check server response of

Server response
NS records
Whois domain
Response headers
Request headers
Raw HTML code
301 Moved Permanently - sem21.com
HTTP Status: 301
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; [email protected])
Server: openresty
Date: Sat, 03 May 2025 05:10:06 GMT
Content-Type: text/html
Content-Length: 166
Connection: keep-alive
Location: https://www.sem21.com/
Strict-Transport-Security: max-age=31536000

HTTP Code 301 Moved Permanently

301 Moved Permanently means that the requested resource has been permanently moved to a new URL. All future requests should use the new address.

When is Code 301 used?

  • When changing a website domain
  • When modifying URL structures
  • When setting up redirects for SEO

What does Code 301 mean for the user?

The browser will automatically redirect the user to the new address, and search engines will update their indexes.

200 OK - https://www.sem21.com/
HTTP Status: 200
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; [email protected])
Server: openresty
Date: Sat, 03 May 2025 05:10:08 GMT
Content-Type: text/html
Content-Length: 17926
Last-Modified: Fri, 24 Feb 2023 10:45:16 GMT
Connection: keep-alive
Vary: Accept-Encoding
ETag: "63f8953c-4606"
Strict-Transport-Security: max-age=31536000
Accept-Ranges: bytes

HTTP Code 200 OK

200 OK is a standard successful HTTP server response. It means that the client’s request (e.g., from a browser) was successfully processed, and the server is delivering the requested data.

When is Code 200 used?

  • When loading a web page
  • When successfully receiving an API response
  • When processing a form or another HTTP request

What does Code 200 mean for the user?

The user receives content without errors, and the page or application functions properly. If Code 200 is accompanied by data, the browser or program processes and displays it to the user.

GET / HTTP/1.1
Host: sem21.com
Accept: */*
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; [email protected])

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="Cache-Control" content="no-transform" /> 
<meta http-equiv="Cache-Control" content="no-siteapp" />
<meta name="baidu-site-verification" content="6OpNLMaHHt" />
<script>
var _hmt = _hmt || [];
(function() {
  var hm = document.createElement("script");
  hm.src = "https://hm.baidu.com/hm.js?36c9314efc3d11ca295c011f12cbee83";
  var s = document.getElementsByTagName("script")[0]; 
  s.parentNode.insertBefore(hm, s);
})();
</script>

<script>
var _hmt = _hmt || [];
(function() {
  var hm = document.createElement("script");
    hm.src = "https://hm.baidu.com/hm.js?e95a649da313751fecc422a3606613a6";
      var s = document.getElementsByTagName("script")[0]; 
        s.parentNode.insertBefore(hm, s);
        })();
        </script>

<title>北京三元网_免费咨询预约适合你的医院医生</title>
<meta name="keywords" content="北京三元网" />
<meta name="description" content="北京三元网：2011年成立的美容整形第三方平台,美呗旗下网站，免费咨询预约适合你的医院医生" />
<link href="/templets/default/style/index.css" rel="stylesheet" type="text/css" />
<script src="/js/pc.js" type="text/javascript"></script>
</head>
<body>
<script>
var _hmt = _hmt || [];
(function() {
  var hm = document.createElement("script");
    hm.src = "https://hm.baidu.com/hm.js?e95a649da313751fecc422a3606613a6";
      var s = document.getElementsByTagName("script")[0]; 
        s.parentNode.insertBefore(hm, s);
        })();
        </script>

<script>
var yousite="m.sem21.com";//这里改为您的手机站访问地址不用带http://
	var url=window.document.location.pathname;
	var site="http://"+yousite+url;
	//平台、设备和操作系统  
	var system ={  
		win : false,  
		mac : false,  
		xll : false  
	};  
	//检测平台 
	var p = navigator.platform;    
	system.win = p.indexOf("Win") == 0;  
	system.mac = p.indexOf("Mac") == 0;  
	system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);  
	//跳转语句
	if(system.win||system.mac||system.xll)
	{}
	else{
		window.location.href=site;
	} 
</script>
<script>var meb_dialog_opt = { s: '//track.meb.com/' };</script>
<script src="//track.meb.com/lib/track/ifr_track.js"></script>
<script src="//track.meb.com/dialog/dialog.js"></script>
<div class="main">
  <div id="top" >
    <div class="top_1">
    <img src="/templets/default/images/logo.jpg" alt="北京三元网"/>
    
      <!--<div class="logo">
        <div class="logo_1"></div>
        <div class="logo_2"><a href="https://www.sem21.com"><img src="https://www.sem21.com/uploads/allimg/120919/1_0925314991.jpg" alt="北京三元网"/></a></div>
      </div>-->
     <!-- <div class="logo_right"></div>-->
    </div>
<div class="nav">
      <ul>
        <li><a href="/">首页</a></li>

        <li><a href="/zx/list_8_1.html">专家介绍</a></li>

        <li><a href="/zx/list_9_1.html">整形医院</a></li>

        <li><a href="/zx/list_5_1.html">整形价格</a></li>

        <li><a href="/zx/list_7_1.html">整形案例</a></li>

        <li><a href="javascript:openChat({eventSource:'INDEX_BTN_TOP'});" rel="nofollow">在线咨询</a></li>
<!--<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>-->
      </ul>
    </div>
<!--
    <div class="pro">
      <div class="pro_1">
        <div class=" pro_lanmu">整形美容</div>
        <div class=" pro_lanmu_1">

        </div>
      </div>
      <div class="pro_1">
        <div class=" pro_lanmu">皮肤美容</div>
        <div class=" pro_lanmu_1">

</div>
      </div>
      <div class="pro_1">
        <div class=" pro_lanmu">美容</div>
        <div class=" pro_lanmu_1">


</div>
      </div>
<div class="pro_1">
        <div class=" pro_lanmu">口腔美容</div>
        <div class=" pro_lanmu_1">


</div>
      </div>
    </div>
-->
  </div>
</div>

<!-- /header -->
<div id="banner_bg">
  <div class="main">
    <div class="banner"> 
   <a href="javascript:openChat({eventSource:'INDEX_BTN_TOP'});"><img src="/templets/default/images/banner_1.jpg" alt="banner"/></a>
    </div>
    <div class="content">
      <div class="content_1">
        <div class="jiaodian">
<a href="javascript:openChat({eventSource:'INDEX_BTN_TOP'});"><img src="/templets/default/images/jiaodian_1.gif" /></a>
        </div>
        <div class="news">
          <div class="news_1">
            <div class="title">每日资讯</div>
          </div>
<div class="news_2">
            <div class="news_2_1"><strong>注射玻尿酸效果</strong></div>
            <div class="news_2_2">皱纹是人们在生长过程中必经的衰老阶段，但是谁不想留住青春美丽容颜呢?因此很多人都把目光投向了美容，玻尿...【<a href="/zx/1.html">详情</a>】</div>
          </div>

          <div class="news_3">
            <ul>
<li><a href="/zx/9776.html">北京联合丽格杨大平怎么</a></li>
<li><a href="/zx/9775.html">北京禾美嘉任学会脂肪填</a></li>
<li><a href="/zx/9774.html">北京韩啸白永辉怎么样</a></li>
<li><a href="/zx/9773.html">北京韩啸白永辉怎么样</a></li>
<li><a href="/zx/9772.html">北京韩啸侯泽民怎么样</a></li>
<li><a href="/zx/9771.html">北京韩啸金世贤怎么样</a></li>
<li><a href="/zx/9770.html">北京东方瑞丽冯立哲怎么</a></li>
<li><a href="/zx/9769.html">北京东方瑞丽张志义怎么</a></li>
<li><a href="/zx/78.html">牙齿矫正要多少钱</a></li>
<li><a href="/zx/5831.html">龅牙、地包天、深覆合，</a></li>
<li><a href="/zx/7160.html">牙齿矫正后，我的脸型及</a></li>
<li><a href="/zx/7044.html"> 做牙齿矫正手术矫正牙齿</a></li>
<li><a href="/zx/232.html"> 牙齿矫正多少钱？什么年</a></li>
<li><a href="/zx/4718.html">牙齿矫正要多少钱</a></li>
<li><a href="/zx/7063.html">牙齿矫正后会改变脸型吗</a></li>
<li><a href="/zx/9111.html">牙齿缺失不修复对人体的</a></li>
<li><a href="/zx/9638.html">不要担心无法拥有“北极</a></li>
<li><a href="/zx/1116.html">北京彤美刘风卓双眼皮修</a></li>
<li><a href="/zx/9768.html">隆鼻修复多久可以做？对</a></li>
<li><a href="/zx/9767.html">除皱是选择玻尿酸还是肉</a></li>
<li><a href="/zx/9766.html">如懿vs璎珞，你pick哪一个</a></li>
<li><a href="/zx/9765.html">哺乳过后，胸部萎缩不到</a></li>
<li><a href="/zx/9764.html">男生会不会在乎女友整形</a></li>
<li><a href="/zx/9763.html">吸脂到底是个什么原理呢</a></li>
<li><a href="/zx/9762.html">你真的适合做光子嫩肤吗</a></li>
<li><a href="/zx/9761.html">南京腰腹吸脂术后恢复过</a></li>
<li><a href="/zx/9760.html">如何快速有效的除去皱纹</a></li>
<li><a href="/zx/9759.html">美人在骨不在皮 什么是真</a></li>

            </ul>
          </div>
          
        </div>
        <div class="xiangmu">
          <div class="title">经典项目</div>
          <div class="xiangmu_1">
            <ul>
              <li style=" background:url(/templets/default/images/pro_1.gif) no-repeat;"><a href="javascript:openChat({eventSource:'INDEX_BTN_TOP'});"></a></li>
              <li style=" background:url(/templets/default/images/pro_1.gif) -105px 0px no-repeat;"><a href="javascript:openChat({eventSource:'INDEX_BTN_TOP'});"></a></li>
              <li style=" background:url(/templets/default/images/pro_1.gif) 0px -57px no-repeat;"><a href="javascript:openChat({eventSource:'INDEX_BTN_TOP'});"></a></li>
              <li style=" background:url(/templets/default/images/pro_1.gif) -105px -57px no-repeat;"><a href="javascript:openChat({eventSource:'INDEX_BTN_TOP'});"></a></li>
              <li style=" background:url(/templets/default/images/pro_1.gif) 0px -114px no-repeat;"><a href="javascript:openChat({eventSource:'INDEX_BTN_TOP'});"></a></li>
              <li style=" background:url(/templets/default/images/pro_1.gif) -105px -114px no-repeat;"><a href="javascript:openChat({eventSource:'INDEX_BTN_TOP'});"></a></li>
              <li style=" background:url(/templets/default/images/pro_1.gif)  0px -171px no-repeat;"><a href="javascript:openChat({eventSource:'INDEX_BTN_TOP'});"></a></li>
              <li style=" background:url(/templets/default/images/pro_1.gif) -105px -171px no-repeat;"><a href="javascript:openChat({eventSource:'INDEX_BTN_TOP'});"></a></li>
              <li style=" background:url(/templets/default/images/pro_1.gif) -0px -228px no-repeat;"><a href="javascript:openChat({eventSource:'INDEX_BTN_TOP'});"></a></li>
              <li style=" background:url(/templets/default/images/pro_1.gif) -105px -228px no-repeat;"><a href="javascript:openChat({eventSource:'INDEX_BTN_TOP'});"></a></li>
              <li style=" background:url(/templets/default/images/pro_1.gif)  0px -285px no-repeat;"><a href="javascript:openChat({eventSource:'INDEX_BTN_TOP'});"></a></li>
              <li style=" background:url(/templets/default/images/pro_1.gif) -105px -285px no-repeat;"><a href="javascript:openChat({eventSource:'INDEX_BTN_TOP'});"></a></li>
            </ul>
          </div>
        </div>
      </div>
      <div class=" content_2" style="display:none">
        <div class="zxmr_1">
          <div class="title_1">整形美容/皮肤美容</div>
          <div class="title_2">


          </div>
        </div>
        <div class="zxmr_2">
          <div class="zxmr_2_1"> <img src="/templets/default/images/tbody_1.jpg" /> </div>
          <div class="zxmr_2_2">
            <div class="hot"><a href="###"><img src="/templets/default/images/content_4.gif" /></a></div>


            <div class="hot_2">

              <div class="hot_3">
                <ul>

                </ul>
              </div>
            </div>
          </div>
          <div class="sousuo">
            <div class="sousuo_1">
              <div class=" sousuo_1_2">
                <div class="sousuo_1_2_1"><a href="###"><img src="/templets/default/images/content_8.gif" /></a></div>
                <div class="sousuo_1_2_2">
                  <ul>

                  </ul>
                </div>
              </div>
            </div>
            <div class="sousuo_2"><a href="###"><img src="/templets/default/images/content_7.gif" /></a></div>
          </div>
        </div>
      </div>
      <div class="content_3" style="display:none;">
        <div class="zxmr_1">
          <div class="title_1">美容/口腔美容</div>
          <div class="title_2">


          </div>
        </div>
        <div class="content_3_1">
          <div class="wuchuang_1"><a href="###"><img src="/templets/default/images/content_9.gif" /></a></div>
          <div class=" wuchuang_2">

            <div class="wuchuang_2_2">

              <div class="wuchuang_2_2_2"><img src="/templets/default/images/content_11.gif" /></div>
            </div>
            <div class="meibai_1">
                <ul>

                </ul>
              </div>
          </div>
          <div class="duibi">
               <div class="duibi_1"><img src="/templets/default/images/content_12.gif" /></div>
               <div class="duibi_2">
                    <img src="/templets/default/images/content_13.gif" /><span>除皱前后对比</span>
                    <img src="/templets/default/images/content_14.gif" /><span>凹陷填充前后</span>
               </div>
            
          </div>
        </div>
      </div>
      <div class="content_4">
         <div class="content_4_1">
            <div class="content_4_1_1">
              
          <div class="title_1">整形价格/优惠活动</div>
          <div class="title_2">



          </div>
        
             </div>
            <div class="content_4_1_2">
               <div class="tuomao">
                  <img src="/templets/default/images/content_16.gif" />
               </div>
               
               <div style=" margin-left:12px;" class=" wuchuang_2">
<div class="wuchuang_2_1">
              <div class="wuchuang_2_1_1">为什么北京隆鼻价格从几</div>
              <div class="wuchuang_2_1_2">很多人都知道北京隆鼻价格几乎到天价，去面诊刘彦军和巫文云、李战强、王英勇这些医生，价格上十万甚至几十万，这是为......<a href="/zx/1206.html">[详细]</a></div>
            </div>

            <div class="wuchuang_2_2">
              <div style=" float:left;" class="wuchuang_2_2_2"><img src="/templets/default/images/content_17.gif" /></div>
<div style=" float:right" class="wuchuang_2_2_1">
                <div class=" wuchuang_2_2_1_1">龅牙、地包天、深覆合，</div>
                <div class="wuchuang_2_2_1_2">今...</div>
              </div>
  
            </div>
            <div class="meibai_1">
                <ul>
<li><a href="/zx/235.html">妊娠纹怎么去除？有哪些</a></li>
<li><a href="/zx/1347.html">日本十仁美容整形医院价</a></li>
<li><a href="/zx/256.html">怎样美白，美白有哪些方</a></li>
<li><a href="/zx/264.html">疤痕可以修复吗，什么方</a></li>
<li><a href="/zx/262.html">怎样去除狐臭，可以侧地</a></li>
<li><a href="/zx/999.html">韩国整容经历一辈子难忘</a></li>
<li><a href="/zx/1428.html">北京八大处的整形医生价</a></li>
<li><a href="/zx/261.html">怎样去太田痣，哪家医院</a></li>
<li><a href="/zx/257.html">嫩肤有哪些方法，激光，</a></li>
<li><a href="/zx/220.html">什么是兔唇？兔唇是怎么</a></li>

                </ul>
              </div>
          </div>
            </div>
         </div>
         <div class="content_4_2">
             <div class="zixun">整形医院</div>
             <div class="zixun_2">
                <ul>
<li><a href="/zx/2655.html"><span>北京常好丽格医院怎么样</span><br />联合丽格总部设于北京。2013至2</a></li>
<li><a href="/zx/2788.html"><span>合肥壹加壹美容医院怎么</span><br />  合肥壹加壹美容医院（one&only）</a></li>
<li><a href="/zx/2787.html"><span>合肥壹美尚整形怎么样?</span><br />合肥壹美尚成立于2018年9月。壹加</a></li>
<li><a href="/zx/2898.html"><span>呼和浩特华医刘露吸脂怎</span><br />呼和浩特华医刘露吸脂怎么样？价</a></li>
<li><a href="/zx/2897.html"><span>杭州东方吸脂怎么样？价</span><br />杭州东方吸脂怎么样？价格案例分</a></li>
<li><a href="/zx/2896.html"><span>武汉匠星吸脂怎么样？价</span><br />武汉匠星吸脂怎么样？价格案例分</a></li>

                </ul>
             </div>
         </div>
      </div>
      <div class="content_5">
           <div class="content_5_1">
               <ul>
                  <li><a href="/zx/list_7_1.html">案例列表</a></li>
                </ul>
            </div>
           <div class="zhuanjia">
              <ul>
<li><div class="zhuanjia_img"><a href="/zx/78.html"><img src="/uploads/201009/1-201009113U1X7-lp.jpg" /></a></div>
                      <div class="zhuanjia_text">
                         <span>牙齿矫正要多少钱</span>
                      </div>
                 </li>
<li><div class="zhuanjia_img"><a href="/zx/9768.html"><img src="/uploads/allimg/200525/1-200525163557-lp.jpg" /></a></div>
                      <div class="zhuanjia_text">
                         <span>隆鼻修复多久可以</span>
                      </div>
                 </li>
<li><div class="zhuanjia_img"><a href="/zx/2143.html"><img src="/uploads/allimg/190802/1-1ZP2113P8-lp.jpg" /></a></div>
                      <div class="zhuanjia_text">
                         <span>长沙鹏爱付玲媛</span>
                      </div>
                 </li>
<li><div class="zhuanjia_img"><a href="/zx/2151.html"><img src="/uploads/allimg/190802/1-1ZP2120233-lp.jpg" /></a></div>
                      <div class="zhuanjia_text">
                         <span>上海华美特贝茨丰</span>
                      </div>
                 </li>
<li><div class="zhuanjia_img"><a href="/zx/2140.html"><img src="/uploads/allimg/190802/1-1ZP2113139-lp.jpg" /></a></div>
                      <div class="zhuanjia_text">
                         <span>重庆时光李理鼻综</span>
                      </div>
                 </li>
                 
              </ul>
           </div>
      </div>
     
    </div>
<div class="footer">
       
       <div class="footer_2"><a href="http://www.sem21.com/" target="_blank" title="北京三元网">北京三元网</a> © 2011~2012  




<meta name="baidu-site-verification" content="WbGUoqouHr" />
<!-- Baidu Button BEGIN -->
<script type="text/javascript" id="bdshare_js" data="type=slide&img=4&mini=1&pos=left&uid=0" ></script>
<script type="text/javascript" id="bdshell_js"></script>
<script type="text/javascript">
document.getElementById("bdshell_js").src = "http://bdimg.share.baidu.com/static/js/shell_v2.js?cdnversion=" + Math.ceil(new Date()/3600000);
</script>
<!-- Baidu Button END -->
  </div>
<script>
var _hmt = _hmt || [];
(function() {
  var hm = document.createElement("script");
  hm.src = "//hm.baidu.com/hm.js?45e12f2e5b597ef82a9beccca4d9df99";
  var s = document.getElementsByTagName("script")[0]; 
  s.parentNode.insertBefore(hm, s);
})();
</script>

  </div>
</div>
</body>
</html>

Whois info of domain

Domain Name: SEM21.COM
Registry Domain ID: 1751932680_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.22.cn
Registrar URL: http://www.22.cn
Updated Date: 2025-03-08T13:20:13Z
Creation Date: 2012-10-13T19:06:35Z
Registry Expiry Date: 2026-10-13T19:06:35Z
Registrar: 22net, Inc.
Registrar IANA ID: 1555
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: +86.571.88276020
Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: NS1.22.CN
Name Server: NS2.22.CN
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2025-05-03T05:09:45Z <<<
For more information on Whois status codes, please visit https://icann.org/epp
NOTICE: The expiration date displayed in this record is the date the
TERMS OF USE: You are not authorized to access or query our Whois
by the following terms of use: You agree that you may use this Data only
to: (1) allow, enable, or otherwise support the transmission of mass